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java.lang.IllegalArgumentException: Servlet mapping specifies an unkn
own servlet name Ch3 beer	at org.apache.catalina.core.StandardContext.addServletMapping(StandardContext.java:2234)	at org.apache.catalina.core.StandardContext.addServletMapping(StandardContext.java:2214)	at sun.reflect.GeneratedMethodAccessor40.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)	at java.lang.reflect.Method.invoke(Method.java:585)	at org.apache.commons.beanutils.MethodUtils.invokeMethod(MethodUtils.java:216)	at org.apache.commons.digester.CallMethodRule.end(CallMethodRule.java:505)	at org.apache.commons.digester.Rule.end(Rule.java:276)	at org.apache.commons.digester.Digester.endElement(Digester.java:1058)	at org.apache.xerces.parsers.AbstractSAXParser.endElement(Unknown Source)	at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanEndElement(Unknown Source)	at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl$FragmentContentDispatcher.dispatch(Unknown Source)	at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown Source)	at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)	at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)	at org.apache.xerces.parsers.XMLParser.parse(Unknown Source)	at org.apache.xerces.parsers.AbstractSAXParser.parse(Unknown Source)	at org.apache.commons.digester.Digester.parse(Digester.java:1548)	at org.apache.catalina.startup.ContextConfig.applicationConfig(ContextConfig.java:263)	at org.apache.catalina.startup.ContextConfig.start(ContextConfig.java:624)	at org.apache.catalina.startup.ContextConfig.lifecycleEvent(ContextConfig.java:216)	at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:119)	at org.apache.catalina.core.StandardContext.start(StandardContext.java:4290)	at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:823)	at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:807)	at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:595)	at org.apache.catalina.core.StandardHostDeployer.install(StandardHostDeployer.java:277)	at org.apache.catalina.core.StandardHost.install(StandardHost.java:832)	at org.apache.catalina.startup.HostConfig.deployDirectories(HostConfig.java:701)	at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:432)	at org.apache.catalina.startup.HostConfig.start(HostConfig.java:983)	at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:349)	at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:119)	at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1091)	at org.apache.catalina.core.StandardHost.start(StandardHost.java:789)	at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1083)	at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:478)	at org.apache.catalina.core.StandardService.start(StandardService.java:480)	at org.apache.catalina.core.StandardServer.start(StandardServer.java:2313)	at org.apache.catalina.startup.Catalina.start(Catalina.java:556)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)	at java.lang.reflect.Method.invoke(Method.java:585)	at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:287)	at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:425)